package com.virus.coronavirus.utils;

/**
 * @Author: Bbeginner
 * @Date: 2021/2/21 16:06
 * @Version 1.0
 **/
public class GPS {
    private static double EARTH_RADIUS = 6378.137;
    private static double rad(double d)
    {
        return d * Math.PI / 180.0;
    }
    public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
    {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +
                Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
        s = s * EARTH_RADIUS;
//        s = Math.round(s * 10000) / 10000;
//        s = s * 1000;
//        System.out.println(s);
        return s;
    }


   /* public static void main(String ar[]) {
        GetDistance(30.034543, 121.551069, 39.20489, 118.592771);
    }*/
}
